Double-acting pump



y J. s. HUNTER DOUBLE ACTING PUMP Filed March 1. 1926 2 Sheets-Sheet l amvamfoz Gum/"m s.

24 1927. 1,629,792 May J. s. HUNTER DOUBLE ACTING PUMP Filed March 1, 1925 2 Sheets-Sheet 2 avwcm foz dlfizzmiei Patented May 23-4, 1927.

JOHN SAMUEL HUNTER,

TES

OF COALINGA, CALIFORNIA.

I 1,629,792 PATENT OFFICE.

DOUBLE-ACTING PUMP.

Application filed March 1, .1926. Serial N 0. 91,547. I

This invention aims to provide a simple buteffective pump,

which will operate to elevate upon the Lip-stroke, bu

as well.

to improve generally an utility of devices of that the sliding pistons of liquid not only t on the clown-stroke is within the province-of the disclosure invention appertains.

With the above and which will appear as ceeds, the invention res tion details of construction and claimed, it being um and arrangement herein d to type to which the enhance the other objects in view the description proides in the combinaof parts and in the after described derstood that changes in the precise embodiment of the invention herein disclosed scope of what is c from the spi In the drawings Figure 1 shows in e may be made within the laimed, without departing rit of the invention.

levation, a device constructed in accordance with the invention;

Figure 2 is a longitudinal section showing the upper part of Figure 3 is a ing the 1 Figure the device of Figure 2;

Figure 5 is a cross sec of Figure 3.

The

longitudinal section showower part of the device; 4 is a cross section on the line 4-4 tion on the line 5-5 s an outer barrel 1.

outer barrel 1 is enlarged as at 2, at its upper end, and threaded at 3,

be mounted in a w An inner barrel 4 is so that it may ell casing (not shown). located within the outer barrel 1, in fixed relation thereto. Theparts foot outer barrel 1. ithin the cage wardly closing va oper are openings of the outer barrel 1. The desired number of relief ble 15 is threaded into are fixed with 5 which 8 is mounted on the ates with a seat ring 12 is threaded into the thimble 15 encloses a packing 15 and 16 constitute a gland 15 has an outstanding flange The relief ports 14 are closed by an end.

ports 14.

respect to each other, arrel 4 is threaded into in its turn, is

lower end of the outer barrel 4 has apertures 7 the partition 5.

lower end of the The foot 8 carries a cage 9. 9, there operates a downlve 10. The valve 10 oo- 11, in the foot 8. There 6 in the partition 5.

the upper end ring 12 has any A thimring 12. The 16. The parts The thimble 17 at its upper again, the piston annular valve disk 18 slidable on the thimble 15. The disk 18 is pressed down on the ring 12 and on the upper end of the outer barrel 1, in closed relation to the ports 14, through the instruinentality of a compression spring 19. The compression spring 19 surrounds the thimble 15, and the upper end of the spring abuts against the flange 17 of the thimble.

A tube 20 slides within the packing 16 of the gland, and the tube 20 also hasa tight sliding fit around the inner barrel 4. There are openings 21 in the tube 20. When the tube 20 is at the limit of its downward stroke, the openings 21 are closed by the inner barrel 4. Near to its upper end,-the tube 20 has other openings 22. A piston 23 is mounted on the lower end of the tube 20.

The piston 23 slides in contact with the inner surface of the outer barrel 1. The piston 23 may be denominated a first piston, and second piston, marked by the numeral 24, slides within the inner barrel 4. The second piston 24 is carried by a cage 25. Within the cage 25 operates a ball valve 26 cooperating with a seat 27 in the cage, the ball valve closing downwardly. The cage 25 is mounted on the lower end of an operating member 28, which may be a rod. The rod 28 is held by a securing element 29 in the hub 30 of a head 31. The head 31 is threaded into the upper end of the tube 20, and, thus, the pistons 23 and 24 are connected for simultaneous movement. There are openings 32 in the head 31.

On the up-stroke, the piston-24 sucks liquid into the inner barrel 4, the valve 10 opening, and the valve 26 closing. The piston 23 sucks liquid into the space between the outer barrel 1 and the inner barrel 4, the liquid entering either through the openings 6 in the partition 5, or through the apertures 7 in the inner barrel 4, or by way of both of these sources. WVhen the pistons 24 and 23 move downwardly, the valve 10 closes, and the valve 26 opens. the liquid which is between the outer barrel 1 and the inner barrel 4 through the apertures 7 and upwardly past thevalve 26, and when the pistons 24 and 23 move upwardly 24 boosts the column of water in the inner barrel 4, and the water pours out through the openings 21 in the tube 20, as those openings arrive upon the upper end of the thimble 15. In the event that liquid happens to leak in between the The piston 23 forces piston 23 and the ring 12, the pump Will not hammer and knock, because, on the upstroke, the piston 23 willlitt the imprisoned water, force it throughthe relief ports 14, and cause the Water to raise the valve 18, for the relief of the Water, the spring 19 serving to seat the valve 18 again on the downstroke.

VVhat is claimed is:

A pump comprising an outer barrel, a foot valve for the outer barrel, an inner barrel fixed Within the outer barrel, atube slidable upon the inner barrel. and provided With an outlet, a first piston carried by the tube and slidable between the barrels, a second piston slidable Within the inner barrel and provided with a downwardly closing valve, means for connecting the second piston to the tube to move therewith, and a spring-seated relief valve Which operates at the upper end of the outer barrel, externally of the tube.

In testimony that I claim the foregoing as my oWn I have hereto affixed my signature.

JOHN SAMUEL HUNTER. 

